The bike spoke light works with 1pc long lasting replaceable CR2032 button 3V battery (included). The running time is 30+ hours, which can meet your long time riding lighting needs. There are 3 work modes: quick flash (Blue&white), slow flash (Blue&white) and slow+quick flash (rainbow 7 colors). Press the power button to start and change modes. When riding, change different patterns according to the different speed. Easy installation and removal. No tools needed! This bright bike spoke lights presses and slides securely into place on common 3-spoke cross pattern wheels, regardless of the size or type of bike. Attach and ride confidently, such as mountain bikes, road bikes, hybrid bikes, triathlon Bikes, touring bicycles, etc.